WO2020059430A1 - Automobile windshield - Google Patents

Abstract

[Problem] Cameras and other noise-generating apparatuses are now installed on windshields, which decreases the area in which an antenna can be installed. At the same time, the variety of antennas that would preferably be arranged on a windshield is increasing. The purpose of the present invention is to provide an automobile windshield that includes an antenna that has been arranged so as to be unaffected by noise. [Solution] According to the present invention, a first antenna element (5) is configured from a linear conductor that has a width of no more than 20 µm. As a result, the first antenna element (5) is not visible to the naked eyes of passengers of an automobile and can be arranged in the vertical-direction middle of a windshield body (7).

Description

Car windshield

The present disclosure relates to an automobile windshield having an antenna.

Patent Document 1 describes an antenna glass for a windshield of an automobile. In this antenna glass, since the antenna element is arranged at the upper corner, the antenna is less likely to be seen by the occupant, and the power supply unit can be arranged at a position near the upper side of the windshield.

JP 2015-050633 A

ア ン テ ナ As described in Patent Document 1, the antenna installed on the windshield is arranged on the periphery of the windshield in order to make it difficult for the occupant to see. However, various noise generating devices are arranged around the windshield. Devices such as cameras and sensors are installed on the upper part of the windshield, wire harnesses and the like are arranged on pillars to which side edges of the windshield are attached, and an instrument panel exists near the lower part of the windshield. In recent years, devices such as cameras and sensors have often been installed above windshields, particularly for automatic driving and driving assistance. In order to avoid noise generated from these devices and members, it is desirable to arrange the antenna so as to avoid the periphery of the windshield.

In addition, with the multifunctionality of automobiles, windshields are used for AM radio broadcasting, FM radio broadcasting, digital television broadcasting, digital radio broadcasting (DAB), mobile phones, intelligent transportation systems (ITS), And various antennas for global positioning system (GPS).

(4) As described above, it is desirable to dispose the antenna so as to avoid the upper corners and the like that have been conventionally installed, and the types of antennas that are desired to be installed are increasing. In view of such a problem, an object of the present invention is to provide an automobile windshield in which an antenna is arranged so as not to be affected by noise.

At least some embodiments of the present invention are automotive windshields (1), comprising a windshield body (7) and an antenna provided inside or on the surface of the windshield body. Has a first antenna element (5) at least partially arranged at an intermediate portion in the vertical direction of the windshield main body, wherein the first antenna element is formed of one or more linear conductors having a width of 20 μm or less. It is characterized by becoming. Here, the “intermediate portion” in the up-down direction means the center portion of the field of view of the occupant sitting on the driver's seat or the passenger seat in the windshield main body. Further, the first antenna element may have a portion arranged in a test area A defined in an appendix of JIS R3212-1992.

According to this configuration, since the first antenna element is thin and invisible, the first antenna element can be arranged at the center or the test area A where the occupant's field of view should be secured. Therefore, even if noise occurs at the peripheral portion of the windshield main body, the first antenna element can be arranged on the windshield main body so as not to be affected by the noise.

少 な く と も At least some embodiments of the present invention are characterized in that, in the above configuration, the linear conductor includes portions arranged in parallel with each other, and the interval between the portions adjacent to each other is 60 μm or more.

According to this configuration, the invisibility of the first antenna element can be improved.

At least some embodiments of the present invention are selected from the group consisting of a camera (2), a sensor (3), a V2X (Vehicle to Everything) compatible device (4), and a drive recorder in any of the above configurations. One or more noise generating devices are mounted on top of the windshield body, and the antenna is separated from the noise generating devices by at least 100 mm. In this configuration, the noise generating device may have a clock frequency of 100 MHz or more.

According to this configuration, the antenna can be arranged so as not to be affected by noise generated from the noise generating device.

少 な く と も At least some embodiments of the present invention are characterized in that, in any of the above configurations, the antenna is separated from the lower end of the windshield main body by 50 mm or more.

According to this configuration, the antenna can be arranged so as not to be affected by noise generated from the instrument panel.

In at least some embodiments of the present invention, in any one of the above structures, the first antenna element includes a digital television broadcast, a digital radio broadcast (DAB), a mobile phone (5a), an intelligent transportation system (ITS) ( 5c) or Global Positioning System (GPS) (5b).

According to this configuration, an antenna of the type required to be provided on the windshield in recent years can be arranged on the windshield.

In at least some embodiments of the present invention, in any one of the above-described configurations, the antenna extends vertically in the left-right center of the windshield main body so as to pass laterally of the test area A. , An FM radio antenna element (14a) made of a wire having a width of 25 μm or less, and a wire extending horizontally above and / or below the test area A and having a width of 25 μm or less. A second antenna element (14) including an AM radio antenna element (14b) is further provided.

According to this configuration, since the FM radio antenna element and the AM radio antenna element become invisible, they can be arranged in an area that could not be arranged conventionally.

According to the present invention, it is possible to provide an automobile windshield in which an antenna is arranged so as not to be affected by noise.

Schematic front view of the laminated glass according to the first embodiment Schematic sectional view of the laminated glass according to the first embodiment Schematic front view of the laminated glass according to the second embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic front view of the windshield 1 according to the first embodiment as viewed from the vehicle interior side.

カ メ ラ A camera 2 and a sensor 3 such as a rain sensor are attached to the center of the upper part of the windshield 1 in the left-right direction. A V2X (vehicle-to-everything) compatible device 4 such as DSRC (narrow area communication) is mounted on the upper side of the windshield 1 and outside the camera 2 and the sensor 3 in the left-right direction. Instead of or in addition to these devices, other devices such as a drive recorder may be attached to the upper portion of the windshield 1.

{Circle around (1)} On the windshield 1, a first antenna element 5 for digital television broadcasting (DTV) and / or digital radio broadcasting (DAB) and a feeder 6 capacitively coupled to the first antenna element 5 are arranged.

FIG. 2 is a cross-sectional view of a portion of the windshield 1 to which the first antenna element 5 is attached. The windshield 1 has a windshield main body 7 and an antenna film 8 mounted inside the windshield main body 7. The windshield main body 7 includes an inner glass plate 9 disposed on the vehicle interior side, an outer glass plate 10 disposed on the vehicle interior side, and an intermediate layer 11 for bonding the inner glass plate 9 and the outer glass plate 10. It is a laminated glass.

The windshield main body 7 is gently curved so that the outer surface swells. The inner surface of the inner glass plate 9 and the outer surface of the outer glass plate 10 form the inner surface and the outer surface of the windshield main body 7, respectively. The distance between the outer surface of the inner glass plate 9 and the inner surface of the outer glass plate 10 may be constant, but may change, for example, such that it becomes smaller or larger as it goes upward. The intermediate layer 11 is made of an adhesive resin that transmits visible light. For example, as the intermediate layer 11, polyvinyl butyral and ethylene vinyl acetate can be used.

The antenna film 8 has the film 12 and the first antenna element 5 attached to the film 12. The film 12 is a base material that supports the first antenna element 5, and is made of a resin that transmits visible light. As the resin constituting the film 12, for example, polyethylene terephthalate, polyethylene, polymethyl methacrylate, polyvinyl chloride, polyester, polyolefin, polycarbonate, polystyrene, polypropylene, nylon and the like can be used. The first antenna element 5 includes one or a plurality of linear conductors. For example, as a material of the first antenna element 5, a metal such as copper, aluminum, tungsten, and silver can be used. The first antenna element 5 may be constituted by a single linear conductor arranged in a single stroke, or may be constituted by a plurality of linear conductors arranged so as to be parallel or intersecting with each other. For example, the first antenna element 5 has a plurality of longitudinally (up and down directions along the windshield main body 7) and laterally (left and right directions along the windshield main body 7) plural forms so as to form a mesh shape. A linear conductor may be arranged.

(4) The width of the linear conductor forming the first antenna element 5 is not more than 20 μm so that an occupant sitting in the driver's seat or the passenger seat cannot see with the naked eye. When a plurality of linear conductors are arranged in parallel with each other, the distance between the linear conductors is set to 60 μm or more, preferably 1.25 mm or more, so that it becomes more difficult for the occupant to visually recognize the first antenna element 5 with the naked eye. . It is preferable that the vertical interval is larger than the horizontal interval (for example, if the latter is 1.25 mm or more, the former is 2 mm or more). This is because the visibility difficulty is related to the distance between the linear conductors projected on a plane orthogonal to the occupant's line of sight, and the longitudinal direction of the windshield 1 is inclined with respect to this plane. In order to obtain good receiving sensitivity, the width of the linear conductor forming the first antenna element 5 is preferably 1 μm or more.

The antenna film 8 can be formed by etching, printing, transfer, or the like. The formation of the antenna film 8 by etching is suitable for setting the width of the linear conductor forming the first antenna element 5 to 20 μm or less.

(4) The formation of the antenna film 8 by etching will be described. First, a thin metal film serving as a material of the first antenna element 5 is applied to the film 12 by, for example, sticking, plating, sputtering, CVD, PVD, vacuum deposition, ion plating, or the like. . At this time, it is preferable to provide a film such as a black paint between the film 12 and the metal thin film. Next, a resist layer is provided on the metal thin film, and a pattern is transferred to the resist layer by photolithography or the like. After development and washing, the metal thin film and the film such as paint in the portion not covered with the resist layer are removed by etching. In order to increase the invisibility of the first antenna element 5 when the windshield 1 is viewed from the interior of the vehicle, the antenna film is formed such that the surface of the first antenna element 5 covered with a color paint or the like faces the interior of the vehicle. 8 is preferably arranged in the intermediate layer 11. When it is desired to increase the invisibility of the first antenna element 5 when the windshield 1 is viewed from outside the cabin, the surface of the first antenna element 5 covered with a film of a paint or the like has a surface facing the outside of the cabin. The antenna film 8 may be disposed in the intermediate layer 11 so as to face.

Refer again to FIG. The first antenna element 5 is partially disposed at an intermediate portion in the vertical direction of the windshield main body 7. Here, the intermediate portion in the up-down direction means the central portion of the field of view of the occupant sitting on the driver's seat or the passenger seat in the windshield main body 7. The distance (L1) from the device that generates noise to the antenna is preferably 100 mm or more. Furthermore, the vertical distance (L2) from the upper edge of the windshield main body 7 to the upper end of the antenna should be 50 mm or more so that even if a device that generates noise in a retrofit is installed on the upper part, the noise is not affected. It is preferable that Further, in order to avoid an influence from an instrument panel (not shown) that generates noise, a vertical distance (L3) from a lower edge of the windshield main body 7 to a lower end of the antenna is preferably 50 mm or more.

A test area A is defined on the windshield 1. The test area A is defined by JIS R32112-1992 "Test Method for Safety Glass for Automobiles" in the appendix "Test Area for Safety Glass Used All Over", and the outline of the specification is as follows.
The test area A is an area on the outer surface of the windshield surrounded by the following four planes extending in the −X direction from the point V.
(1) V _A plane that passes through _one point and is parallel to the Y-axis and is inclined at 3 ° in the + Z direction with respect to the X-axis.
(2) V A plane that passes through _two points and is parallel to the Y axis, and is inclined by 1 ° in the −Z direction with respect to the X axis.
(3) _{V 1} point, ₂ points _V street X-axis in the + Y direction 13 ° inclined vertical plane.
(4) _{V 1} point, 20 ° inclined vertical face in the -Y direction of the street X-axis _two points _V.
Here, the V ₁ point and the V ₂ point are respectively the R point (the position of the hip joint point of the model when the human model specified in ISO 20176 is seated on the seat or a design standard position corresponding thereto). As the origin, (X, Y, Z) coordinates (unit: mm) are the positions of (68, 5, 665) and (68, 5, 589).

The test area A has a substantially trapezoidal shape and is an area applied to each test of double image, perspective distortion, and color identification of the safety glass used for the windshield 1. That is, the test area A is an area in which an object that obstructs the field of view of the occupant of the vehicle should not be arranged. The first antenna element 5 has an upper portion in the left-right direction inside the test area A, and a lower lower portion in the left-right direction located near the side edge of the windshield main body 7, and is capacitively coupled to the feeder 6. . A projection area 13 of a head-up display (HUD) is provided in front of the driver's seat of the windshield main body 7, and the projection area 13 partially overlaps the test area A and the first antenna element 5. ing.

た め Since the width of the linear conductor constituting the first antenna element 5 is 20 μm or less, the first antenna element 5 cannot be visually recognized by the occupant. Further, since the linear conductor has a low linear density and the surface of the linear conductor on the vehicle interior side is covered with a film such as a black paint, the invisibility of the first antenna element 5 is further increased. By making the first antenna element 5 invisible, the first antenna element 5 can be arranged in the center portion or the test area A of the windshield main body 7 where the antenna could not be arranged conventionally. That is, the area where the first antenna element 5 can be installed is widened, and more antennas can be arranged on the windshield 1 than before. Further, a noise generating device such as a camera is arranged near the upper or upper corner of the windshield main body 7 where the antenna is conventionally installed. Therefore, the antenna is arranged at a predetermined distance or more from the noise generating device so as not to be affected by noise generated from the noise generating device. The central part of the windshield main body 7 and the test area A are not affected by noise generated from the equipment having a clock frequency of about 100 MHz or more, even if the equipment is mounted on the upper part of the windshield 1. In addition, by setting the vertical distance from the upper edge and the lower edge of the windshield main body 7 to the antenna to be equal to or more than a predetermined value, noise from equipment and an instrument panel installed later on the windshield 1 is installed. Is suppressed. Further, since the width of the linear conductor of the first antenna element 5 is small, the influence on the visible light transmittance of the windshield 1 is small, and the visible light transmittance of the windshield 1 is set to 70% or more. it can.

Next, a windshield 1 according to the second embodiment will be described with reference to FIG. The components having the same names and reference numerals as those of the first embodiment have the same features as those of the first embodiment except for the features described in particular.

The windshield 1 according to the second embodiment has a first antenna element 5 arranged at least in a middle part or a test area A in the vertical direction of the windshield main body 7 and a first antenna element 5 arranged near the test area A. It has a second antenna element 14 and a third antenna element 15 arranged above the windshield main body 7.

The first antenna element 5 has a mobile phone antenna element 5a, a GPS antenna element 5b, and an ITS antenna element 5c, and is disposed in the intermediate layer 11 (see FIG. 2). The arrangement area of the mobile phone antenna element 5a has a rectangular shape, and its lower part overlaps the upper part of the test area A on the driver's seat side in the left-right direction. The installation area of the GPS antenna element 5b has an elliptical shape, and the upper part in the left-right direction overlaps the lower part of the test area A on the driver's seat side in the left-right direction. Further, the GPS antenna element 5b is capacitively coupled to a feeder 6 arranged near a lower side edge of the windshield main body 7. The ITS antenna element 5c is located at the lower corner side of the passenger seat side, and its arrangement area is such that one side is substantially parallel to the lower edge of the windshield main body 7 and the other side is on the passenger seat side of the windshield main body 7. It has a triangular shape that is substantially parallel to the side edges. An inner portion in the left-right direction of an intermediate portion of the arrangement region overlaps a lower outer portion in the left-right direction of the test region A on the passenger seat side. In addition, the ITS antenna element 5c is capacitively coupled to a feeder 6 arranged near the lower side edge of the windshield main body 7. The projection area 13 of the HUD is arranged so as to overlap the test area A on the driver's seat side at the upper part thereof, but not to overlap the first antenna element 5.

The second antenna element 14 extends vertically in the center of the windshield main body 7 in the left-right direction so as to pass through the side of the test area A, and has a width (diameter) of 25 μm or less, preferably 20 μm or less. It has a radio antenna element 14a and an AM radio antenna element 14b extending laterally above and below the test area A and having a width of 25 μm or less, preferably 20 μm or less. The FM radio antenna element 14a and the AM radio antenna element 14b are formed by attaching wires to the intermediate layer 11 (see FIG. 2), but may be formed by etching or the like as in the first antenna element 5. Good. Since the linear conductor forming the second antenna element 14 has no other linear conductor disposed in parallel in the vicinity thereof, even if the width of the linear conductor of the first antenna element 5 is 25 μm, which is wider than the linear conductor of the first antenna element 5, the occupant is not required. Not visible.

ノ イ ズ The noise generating device arranged above the windshield 1 of the second embodiment is only the camera 2 arranged at the center in the left-right direction. Therefore, there is a region on the upper side of the windshield main body 7 which is not affected by noise, and the third antenna element 15 is arranged there. The third antenna element 15 is an antenna for DTV and / or DAB. The third antenna element 15 extends from the feeder 6 provided on the left and right of the upper part of the windshield main body 7, a linear conductor extending downward in the vertical direction, and extends inward in the horizontal direction from the lower end thereof. It consists of a linear conductor. The width of the linear conductor of the third antenna element 15 is 25 μm or less, preferably 20 μm or less. The third antenna element 15 is formed by printing, but may be formed by etching or attaching a wire.

(4) It is preferable that the distance (L1) to the third antenna element 15, which is the antenna closest to the camera 2 that is the noise generating device and is disposed partially below the camera 2, is 100 mm or more. The vertical distance (L2) from the upper edge of the windshield main body 7 to the upper end of the third antenna element 15, which is the closest antenna, is preferably 50 mm or more. The vertical distance (L3) from the lower edge of the windshield main body 7 to the lower end of the GPS antenna element 5b, which is the closest antenna, is preferably 50 mm or more.

Although the description of the specific embodiment is finished above, the present invention can be widely modified without being limited to the above embodiment. The feed unit may be coupled to the antenna element via a conductor instead of the capacitive coupling. Each antenna element may be affixed to the surface of the windshield main body instead of being disposed in the intermediate layer. The types of the above-described antenna elements (for DTV, DAB, and the like) are examples, and other types of antennas may be used. The entire contents of the basic application claiming priority under the Paris Convention of the present application and the entire contents of the prior art cited in the present application are incorporated herein by reference.

1: Windshield 2: Camera 3: Sensor 4: V2X compatible device 5: First antenna element 6: Feeding unit 7: Windshield main body 13: Projection area of head-up display (HUD) 14: Second antenna element

Claims (8)

1. A car windshield,
   A windshield body,
   An antenna provided inside or on the surface of the windshield main body,
   The antenna has a first antenna element at least partially disposed in an intermediate portion in the vertical direction of the windshield main body, and the first antenna element is formed of one or more linear conductors having a width of 20 μm or less. A windshield characterized by that.
2. 2. The windshield according to claim 1, wherein the linear conductor includes portions arranged in parallel with each other, and an interval between the adjacent portions is 60 μm or more. 3.
3. One or more noise generating devices selected from the group consisting of a camera, a sensor, a V2X compatible device, and a drive recorder are attached to an upper portion of the windshield main body,
   3. The windshield according to claim 1, wherein the antenna is separated from the noise generator by 100 mm or more. 4.
4. The windshield according to claim 3, wherein the noise generating device has a clock frequency of 100 MHz or more.
5. The windshield according to any one of claims 1 to 4, wherein the antenna is separated from the lower end of the windshield main body by 50 mm or more.
6. The windshield according to any one of claims 1 to 5, wherein the first antenna element is for a digital television broadcast, a digital radio broadcast, a mobile phone, an intelligent transportation system, or a global positioning system.
7. The windshield according to any one of claims 1 to 6, wherein the first antenna element has a portion arranged in a test area A defined in an appendix of JIS R3212-192.
8. The antenna includes an antenna element for FM radio, comprising a wire having a width of 25 μm or less extending vertically in a center of the windshield main body in the left-right direction so as to pass through the side of the test area A; And a second antenna element extending laterally above and / or below the test area A and including an AM radio antenna element made of a wire having a width of 25 μm or less. Item 8. A windshield according to item 7.

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